Warp stabilizer, works better on lower resolution video?

Just recently, I have started using Magic Lantern Raw (converted to DNG) for my video projects. And in my editing process, I usually use Warp Stabilizer, well, for stabilizing stuff..

But as I was using it with my DNG files, the result was rather jittery than what I usually get. I have tried to tweak the settings but still same results. Then I tried using a proxy file of the clip, and it worked like a charm.

Questions:

1. Does warp stabilizer work better on lower resolution clips?
2. Does the frame rate of a video affect the stabilizing?
3. Is there any issues with DNG and Warp Stabilizer?

I understand that the more the frames the longer warp would analyze the video.. but what I mean with my question was (sorry I did not specifically asked this) does lower frame rate or different frame rates affect the quality of the stabilization?